Imagick::compareImageLayers()

(PECL imagick 2.0.0)

Returns the maximum bounding region between images

说明

Imagick::compareImageLayers(int $method): Imagick

Compares each image with the next in a sequence and returns the maximum bounding region of any pixel differences it discovers.此方法在Imagick基于ImageMagick 6.2.9以上版本编译时可用。

参数

$method

One of the layer method constants.

返回值

成功时返回TRUE。

错误／异常

错误时抛出 ImagickException。

范例

Example #1 Using Imagick::compareImageLayers()

Comparing image layers

<?php
/* create new imagick object */
$im = new Imagick("test.gif");
/* optimize the image layers */
$result = $im->compareImageLayers(imagick::LAYERMETHOD_COALESCE);
/* work on the $result */
?>

参见

• Imagick::optimizeImageLayers() Removes repeated portions of images to optimize
• Imagick::writeImages() Writes an image or image sequence
• Imagick::writeImage() 把图片写入指定的文件